The entropy_nrf_get_entropy_isr(), which is specific to this driver,
is in fact equivalent of generic entropy_get_entropy_isr(..., 0).
This commit removes the entropy_nrf_get_entropy_isr() function
and replaces its usage by call to generic entropy API.
Signed-off-by: Piotr Zięcik <piotr.ziecik@nordicsemi.no>
This commit optimizes access to device data using direct reference
instead of relying on the driver_data field in the device structure.
Such approach saves few cycles on time-critical paths.
Signed-off-by: Piotr Zięcik <piotr.ziecik@nordicsemi.no>
The old algorithm managing random number pools was inefficient and
prone to race conditions. Moreover, its behaviour was not compatible
with the API (provided buffers were filled from the end, leaving
beggining of the buffer untouched if there was not enough random data).
The new implementation is a bit faster and it is race-free as long as
all callers of the entropy_get_entropy_isr() are executed in
"run-to-completion" mode.
Signed-off-by: Piotr Zięcik <piotr.ziecik@nordicsemi.no>
This commit changes the argument passed to ISR to the pointer
to device data structure, removing one dereference in the interrupt
handler.
Signed-off-by: Piotr Zięcik <piotr.ziecik@nordicsemi.no>
This commint replaces function names by more accurate ones.
For example, the isr(), was renamed to rng_pool_put(), which
clerarly indicates what this function is doing.
Signed-off-by: Piotr Zięcik <piotr.ziecik@nordicsemi.no>
The entropy_nrf5_get_entropy_isr(..., ENTROPY_BUSYWAIT)
unconditionally started and stopped hardware random number generator
disrupting management of random data pools implemented by the driver.
Moreover, simultaneous call to mentioned function from different
priorities led to hangup of lower priority call as hardware was
stopped by higher priority call while the other one waited for data.
This commit solves mentioned problems by moving the responsibility
for stopping hardware to the interrupt handler. As result hardware
is stopped only when there is no blocking calls to the
entropy_nrf5_get_entropy_isr() as well as all random data pools
are full.
This commit also fixes interrupt management in the mentioned
function, as previous implementation unconditionally enabled
interrupt causing problems similar to the described above.
Signed-off-by: Piotr Zięcik <piotr.ziecik@nordicsemi.no>
Neither entropy_nrf5_get_entropy_isr() nor isr() protected
access to hardware. As result in some situations a random value
could be "stolen" by a higher priority call interrupting one
of the mentioned functions.
This commit solves this problem by introducing random_byte_get()
which accesses hardware atomically.
Signed-off-by: Piotr Zięcik <piotr.ziecik@nordicsemi.no>
The nrf_rng HAL uses barriers on SoCs which need them to ensure
that all register writes will reach the peripheral immediately.
Signed-off-by: Piotr Zięcik <piotr.ziecik@nordicsemi.no>
The nRF5x entropy driver does not depends on SOC_FAMILY_NRF is therefore
visible and selectable non-nRF5x SoCs. Fix that.
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Depend on the new SOC_COMPATIBLE_NRF symbol instead of the
SOC_FAMILY_NRF symbol.
This allows the driver to be used from the bsim simulated board
Signed-off-by: Alberto Escolar Piedras <alpi@oticon.com>
Missing clear pending RNG_IRQn when generating multiple
random numbers caused CPU to hang at __WFE call in the
loop waiting for new value.
This fixes commit ddb7f88f9e ("drivers: entropy: nrf5: Fix
ENTROPY_BUSYWAIT implementation")
Fixes#9523.
Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
Consistently use
config FOO
bool/int/hex/string "Prompt text"
instead of
config FOO
bool/int/hex/string
prompt "Prompt text"
(...and a bunch of other variations that e.g. swapped the order of the
type and the 'prompt', or put other properties between them).
The shorthand is fully equivalent to using 'prompt'. It saves lines and
avoids tricking people into thinking there is some semantic difference.
Most of the grunt work was done by a modified version of
https://unix.stackexchange.com/questions/26284/how-can-i-use-sed-to-replace-a-multi-line-string/26290#26290, but some
of the rarer variations had to be converted manually.
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
Fixed the ENTROPY_BUSYWAIT implementation from vectoring to
RNG ISR which was preventing the busywait loop to hang
waiting on the VALRDY event which was getting cleared in the
ISR.
Fixes#9356.
Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
A few function prototypes were missing in the native_posix
board and its drivers.
Let's add them.
Signed-off-by: Alberto Escolar Piedras <alpi@oticon.com>
For each driver/model with command line options.
Move its code for the board file into the driver/model file.
Signed-off-by: Alberto Escolar Piedras <alpi@oticon.com>
All the STM32F7 SoCs have a TRNG. Adding support for it is just a matter
of tweaking the #ifdef and including the right file from HAL.
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Bool symbols implicitly default to 'n'.
A 'default n' can make sense e.g. in a Kconfig.defconfig file, if you
want to override a 'default y' on the base definition of the symbol. It
isn't used like that on any of these symbols though, and is
inconsistent.
This will make the auto-generated Kconfig documentation have "No
defaults. Implicitly defaults to n." as well, which is clearer than
'default n if ...'
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
For the native_posix board, implement the new get_entropy_isr call.
The old native get_entropy was already safe for ISRs, so we just
add a wrapper to it.
Signed-off-by: Alberto Escolar Piedras <alpi@oticon.com>
To enable for easier testing, replace direct use of registers
from Nordic's nrfx MDK with accesses via its HAL inlined functions
Signed-off-by: Alberto Escolar Piedras <alpi@oticon.com>
Implement the new entropy_get_entropy_isr() function to allow the kernel
to collect entropy before the scheduler and kernel data structures are
ready. Switch to an nrf-specific version for high-performance
requirements in the BLE Link Layer.
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
To ensure that early code that requires entropy has the HWRNG devices
fully initialized, initialize them all during PRE_KERNEL_1 stage.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
The various macros to do checks in system call handlers all
implictly would generate a kernel oops if a check failed.
This is undesirable for a few reasons:
* System call handlers that acquire resources in the handler
have no good recourse for cleanup if a check fails.
* In some cases we may want to propagate a return value back
to the caller instead of just killing the calling thread,
even though the base API doesn't do these checks.
These macros now all return a value, if nonzero is returned
the check failed. K_OOPS() now wraps these calls to generate
a kernel oops.
At the moment, the policy for all APIs has not changed. They
still all oops upon a failed check/
The macros now use the Z_ notation for private APIs.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Be more obvious about the entropy_native_posix driver
being only a test utility which does not generate real
entropy.
Fixes: #6388
Signed-off-by: Alberto Escolar Piedras <alpi@oticon.com>
Normally a syscall would check the current privilege level and then
decide to go to _impl_<syscall> directly or go through a
_handler_<syscall>.
__ZEPHYR_SUPERVISOR__ is a compiler optimization flag which will
make all the system calls from the driver files directly link
to the _impl_<syscall>. Thereby reducing the overhead of checking the
privileges.
In the previous implementation all the source files would be compiled
by zephyr_source() rule. This means that zephyr_* is a catchall CMake
library for source files that can be built purely with the include
paths, defines, and other compiler flags that all zephyr source
files uses. This states that adding one extra compiler flag for only
one complete directory would fail.
This limitation can be overcome by using zephyr_libray* APIs. This
creates a library for the required directories and it also supports
directory level properties.
Hence we use zephyr_library* to create a new library with
macro _ZEPHYR_SUPERVISOR_ for the optimization.
Signed-off-by: Adithya Baglody <adithya.nagaraj.baglody@intel.com>
Driver APIs might not implement all operations, making it possible for
a user thread to get the kernel to execute a function at 0x00000000.
Perform runtime checks in all the driver handlers, checking if they're
capable of performing the requested operation.
Fixes#6907.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
Clarify the difference between the buffer length and threshold Kconfig
options available in the nRF5 entropy driver.
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
Improve the documentation of entropy_nrf5.c by adding a comment that
clarifies it's characteristics.
Signed-off-by: Sebastian Bøe <sebastian.boe@nordicsemi.no>
Selecting a choice symbol is always a no-op, and the latest version of
Kconfiglib prints a warning. This commit removes all selects of choice
symbols, which might make the Kconfig files a bit clearer and gets rid
of the warnings.
This is just a dumb removal. I did not try to guess the intent of each
select.
Fixes#6849
Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>
Remove unnecessary header inclusion in nordic's nrf5 random
driver which added a dependency to ext/hal/nordic.
Signed-off-by: Alberto Escolar Piedras <alpi@oticon.com>
After porting the rand driver to drivers/entropy, replace the usage of
the old, Buetooth-specific driver with the generic entropy one.
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
The rand driver present in the BLE Link Layer is able to provide
entropy for both threads and ISRs, and so it is more suited to be used
as a generic nRF5x entropy driver instead of the current one. This will
allow applications and the Link Layer to use the same driver without
duplicating it.
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
Use "select USE_STM32_LL_RNG" to select the needed STM32 LL files,
instead of editing ext/hal/st/stm32cube/CMakeLists.txt
Signed-off-by: Erwin Rol <erwin@erwinrol.com>
It appears the STM32F411XE doesn't support RNG so remove enabling it
from the SoC defconfig and flag an error if attempting to build the
driver on that SoC.
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
In STM32 family, RNG IP is available only on F4 and L4 series.
Besides STM32F401 does not support is neither.
Get entropy driver available on STM32 devices supporting it and
generate a compilation issue on STM32 devices that do not own
the RNG IP.
Solves #5448
Signed-Off-By: Erwan Gouriou <erwan.gouriou@linaro.org>
On STM32L4 SoCs RNG is clocked by 48MHz domain.
Hence, besides clock activation, it requires 48M
domain to be enabled.
Tested on:
*nucleo_l476rg
*stm32l476g_disco
*disco_l475_iot1
Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
Introducing CMake is an important step in a larger effort to make
Zephyr easy to use for application developers working on different
platforms with different development environment needs.
Simplified, this change retains Kconfig as-is, and replaces all
Makefiles with CMakeLists.txt. The DSL-like Make language that KBuild
offers is replaced by a set of CMake extentions. These extentions have
either provided simple one-to-one translations of KBuild features or
introduced new concepts that replace KBuild concepts.
This is a breaking change for existing test infrastructure and build
scripts that are maintained out-of-tree. But for FW itself, no porting
should be necessary.
For users that just want to continue their work with minimal
disruption the following should suffice:
Install CMake 3.8.2+
Port any out-of-tree Makefiles to CMake.
Learn the absolute minimum about the new command line interface:
$ cd samples/hello_world
$ mkdir build && cd build
$ cmake -DBOARD=nrf52_pca10040 ..
$ cd build
$ make
PR: zephyrproject-rtos#4692
docs: http://docs.zephyrproject.org/getting_started/getting_started.html
Signed-off-by: Sebastian Boe <sebastian.boe@nordicsemi.no>
Instead of every hardware number generator driver providing an
implementation of this function, use the random device API to
centralize the implementation of this function.
This is a very simplistic function that can be seen as a stepping stone
to refactor the random number generation in Zephyr.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
This should clear up some of the confusion with random number
generators and drivers that obtain entropy from the hardware. Also,
many hardware number generators have limited bandwidth, so it's natural
for their output to be only used for seeding a random number generator.
Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
